Effects of meson-exchange currents on the $(\protect\vec{e},e'p)$ structure functions

Van der Sluys, V.; Ryckebusch, J.; Waroquier, M.

Effects of meson-exchange currents on the $(\protect\vec{e},e'p)$ structure functions

Authors

Van der Sluys, V.

Ryckebusch, J.

Waroquier, M.

Description

The response functions for the unpolarized $(e,e'p)$ and polarized $(\vec{e},e'p)$ reaction are calculated for medium-heavy nuclei under quasifree conditions. The formalism presented here incorporates two-body currents related to meson-exchange and the $Δ(1232)$ excitation. The final-state interaction of the outgoing nucleon with the residual nucleus is handled in a HF-RPA formalism. The sensitivity of the results to the two-body currents is discussed for the five structure functions in quasielastic $(\vec{e},e'p)$ scattering off the target nuclei $^{16}O$ and $^{40}Ca$. A selective sensitivity to the two-body currents is obtained in the longitudinal-transverse interference term $W_{LT}$ where two-body currents can explain part of the discrepancy between the impulse-approximation calculations and the data.
12 pages in LaTex with 5 figures (available on request), INW0703